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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6d2e6711db8ee823deb6e56c765592887494dc5755ff0adb768a32fb6ffd7c' 
  AND token = '6nHb15mDrXljITICYBqaKqk0tjWpAfdGUbSfl/PrKI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}